[builtins] implement Array.prototype[@@iterator] in TFJ builtins

src/code-stub-assembler.h

 // Copyright 2016 the V8 project authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef V8_CODE_STUB_ASSEMBLER_H_
 #define V8_CODE_STUB_ASSEMBLER_H_
 
 #include <functional>
 
 #include "src/compiler/code-assembler.h"
 #include "src/objects.h"
 
 namespace v8 {
 namespace internal {
 
 class CallInterfaceDescriptor;
 class StatsCounter;
 class StubCache;
 
 enum class PrimitiveType { kBoolean, kNumber, kString, kSymbol };
 
+enum class IterationKind { kKeys, kValues, kEntries };
+
 #define HEAP_CONSTANT_LIST(V)                 \
   V(BooleanMap, BooleanMap)                   \
   V(empty_string, EmptyString)                \
   V(EmptyFixedArray, EmptyFixedArray)         \
   V(FalseValue, False)                        \
   V(FixedArrayMap, FixedArrayMap)             \
   V(FixedCOWArrayMap, FixedCOWArrayMap)       \
   V(FixedDoubleArrayMap, FixedDoubleArrayMap) \
   V(HeapNumberMap, HeapNumberMap)             \
   V(MinusZeroValue, MinusZero)                \
@@ skipping 100 matching lines @@
   compiler::Node* SmiMin(compiler::Node* a, compiler::Node* b);
   // Computes a % b for Smi inputs a and b; result is not necessarily a Smi.
   compiler::Node* SmiMod(compiler::Node* a, compiler::Node* b);
   // Computes a * b for Smi inputs a and b; result is not necessarily a Smi.
   compiler::Node* SmiMul(compiler::Node* a, compiler::Node* b);
   compiler::Node* SmiOr(compiler::Node* a, compiler::Node* b) {
     return BitcastWordToTaggedSigned(
         WordOr(BitcastTaggedToWord(a), BitcastTaggedToWord(b)));
   }
 
+  // Smi | HeapNumber operations.
+  compiler::Node* NumberInc(compiler::Node* value);
+
   // Allocate an object of the given size.
   compiler::Node* Allocate(compiler::Node* size, AllocationFlags flags = kNone);
   compiler::Node* Allocate(int size, AllocationFlags flags = kNone);
   compiler::Node* InnerAllocate(compiler::Node* previous, int offset);
   compiler::Node* InnerAllocate(compiler::Node* previous,
                                 compiler::Node* offset);
 
   void Assert(compiler::Node* condition, const char* string = nullptr,
               const char* file = nullptr, int line = 0);
 
@@ skipping 136 matching lines @@
       int additional_offset = 0,
       ParameterMode parameter_mode = INTEGER_PARAMETERS,
       Label* if_hole = nullptr);
 
   // Load Float64 value by |base| + |offset| address. If the value is a double
   // hole then jump to |if_hole|. If |machine_type| is None then only the hole
   // check is generated.
   compiler::Node* LoadDoubleWithHoleCheck(
       compiler::Node* base, compiler::Node* offset, Label* if_hole,
       MachineType machine_type = MachineType::Float64());
+  compiler::Node* LoadFixedTypedArrayElement(
+      compiler::Node* data_pointer, compiler::Node* index_node,
+      ElementsKind elements_kind,
+      ParameterMode parameter_mode = INTEGER_PARAMETERS);
 
   // Context manipulation
   compiler::Node* LoadContextElement(compiler::Node* context, int slot_index);
   compiler::Node* StoreContextElement(compiler::Node* context, int slot_index,
                                       compiler::Node* value);
   compiler::Node* LoadNativeContext(compiler::Node* context);
 
   compiler::Node* LoadJSArrayElementsMap(ElementsKind kind,
                                          compiler::Node* native_context);
 
@@ skipping 91 matching lines @@
   compiler::Node* AllocateJSArray(
       ElementsKind kind, compiler::Node* array_map, compiler::Node* capacity,
       compiler::Node* length, compiler::Node* allocation_site = nullptr,
       ParameterMode capacity_mode = INTEGER_PARAMETERS);
 
   compiler::Node* AllocateFixedArray(ElementsKind kind,
                                      compiler::Node* capacity,
                                      ParameterMode mode = INTEGER_PARAMETERS,
                                      AllocationFlags flags = kNone);
 
+  // Perform CreateArrayIterator (ES6 #sec-createarrayiterator).
+  compiler::Node* CreateArrayIterator(compiler::Node* array,
+                                      compiler::Node* array_map,
+                                      compiler::Node* array_type,
+                                      compiler::Node* context,
+                                      IterationKind mode);
+
+  compiler::Node* AllocateJSArrayIterator(compiler::Node* array,
+                                          compiler::Node* array_map,
+                                          compiler::Node* map);
+
   void FillFixedArrayWithValue(ElementsKind kind, compiler::Node* array,
                                compiler::Node* from_index,
                                compiler::Node* to_index,
                                Heap::RootListIndex value_root_index,
                                ParameterMode mode = INTEGER_PARAMETERS);
 
   // Copies all elements from |from_array| of |length| size to
   // |to_array| of the same size respecting the elements kind.
   void CopyFixedArrayElements(
       ElementsKind kind, compiler::Node* from_array, compiler::Node* to_array,
@@ skipping 481 matching lines @@
     kLessThan,
     kLessThanOrEqual,
     kGreaterThan,
     kGreaterThanOrEqual
   };
 
   compiler::Node* RelationalComparison(RelationalComparisonMode mode,
                                        compiler::Node* lhs, compiler::Node* rhs,
                                        compiler::Node* context);
 
+  void BranchIfNumericRelationalComparison(RelationalComparisonMode mode,
+                                           compiler::Node* lhs,
+                                           compiler::Node* rhs, Label* if_true,
+                                           Label* if_false);
+
+  void GotoUnlessNumberLessThan(compiler::Node* lhs, compiler::Node* rhs,
+                                Label* if_false);
+
   enum ResultMode { kDontNegateResult, kNegateResult };
 
   compiler::Node* Equal(ResultMode mode, compiler::Node* lhs,
                         compiler::Node* rhs, compiler::Node* context);
 
   compiler::Node* StrictEqual(ResultMode mode, compiler::Node* lhs,
                               compiler::Node* rhs, compiler::Node* context);
 
   compiler::Node* HasProperty(
       compiler::Node* object, compiler::Node* key, compiler::Node* context,
@@ skipping 70 matching lines @@
   static const int kElementLoopUnrollThreshold = 8;
 };
 
 #define CSA_ASSERT(x) Assert((x), #x, __FILE__, __LINE__)
 
 DEFINE_OPERATORS_FOR_FLAGS(CodeStubAssembler::AllocationFlags);
 
 }  // namespace internal
 }  // namespace v8
 #endif  // V8_CODE_STUB_ASSEMBLER_H_